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how to get the current working directory's absolute path from irb
...do is get the current working directory's absolute path. Is this possible from irb? Apparently from a script it's possible using File.expand_path(__FILE__)
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Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
...mns to a dataframe df with n columns (n > 0).
These new columns result from the application of a function to one of the columns in the dataframe.
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Semaphore vs. Monitors - what's the difference?
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A Monitor is an object designed to be accessed from multiple threads. The member functions or methods of a monitor object will enforce mutual exclusion, so only one thread may be performing any action on the object at a given time. If one thread is currently executing a m...
How can I find script's directory with Python? [duplicate]
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This won't work if you're running from inside an interpreter, since you'll get NameError: name '__file__' is not defined
– Ehtesh Choudhury
Feb 26 '14 at 21:01
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Longest line in a file
...an specifying a file as an option. In my case, I'll be using output piped from a database query.
– Andrew Prock
Oct 31 '09 at 23:31
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How to remove item from list in C#?
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Short answer:
Remove (from list results)
results.RemoveAll(r => r.ID == 2); will remove the item with ID 2 in results (in place).
Filter (without removing from original list results):
var filtered = result.Where(f => f.ID != 2); returns all ...
Git: How to return from 'detached HEAD' state
... this:
# you are currently in detached HEAD state
git checkout -b commits-from-detached-head
and then merge commits-from-detached-head into whatever branch you want, so you don't lose the commits.
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Importing data from a JSON file into R
Is there a way to import data from a JSON file into R? More specifically, the file is an array of JSON objects with string fields, objects, and arrays. The RJSON Package isn't very clear on how to deal with this http://cran.r-project.org/web/packages/rjson/rjson.pdf .
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Servlet for serving static content
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Though in order to serve content from a folder outside the app (I use it to server a folder from the disk, say C:\resources) I modified the this row: this.basePath = getServletContext().getRealPath(getInitParameter("basePath")); And replaced it with: this...
What are sessions? How do they work?
...side, after successful identification. Then for every HTTP request you get from the client, the session id (given by the client) will point you to the correct session data (stored by the server) that contains the authenticated user id - that way your code will know what user it is talking to.
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